How Big Are A3 and A4 Paper Sizes? Dimensions Explained

Discover the exact dimensions of A3 and A4 paper sizes based on the ISO 216 standard used worldwide.

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A3 paper measures 297 mm x 420 mm (11.7 in x 16.5 in), while A4 paper is 210 mm x 297 mm (8.3 in x 11.7 in). These sizes are based on the ISO 216 international paper size standard, widely used across the globe for a variety of printing and stationery needs.

FAQs & Answers

  1. What are the measurements of A3 paper? A3 paper measures 297 mm by 420 mm (11.7 inches by 16.5 inches) according to the ISO 216 standard.
  2. How does A4 paper size compare to A3? A4 paper is smaller than A3, measuring 210 mm by 297 mm (8.3 inches by 11.7 inches), which makes it exactly half the size of an A3 sheet.
  3. What is the ISO 216 paper size standard? ISO 216 is an international standard that defines the A, B, and C series of paper sizes used globally for printing and stationery.

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If you're interested in learning more about international paper sizes and printing standards, be sure to check out our related content on A5 and A2 paper dimensions and their common uses.

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